And we continue with one of the hottest young singers. Ariana grande. She shot to fame with that huge hit "the way." You're hearing it right now. A low note for the pop star. She's being named in a lawsuit, claiming one of its lines was ripped off. And paula faris has the story. Reporter: Just 20 years old, they're calling her the next mariah carey. This morning, ariana grande's megahit song "the way," rocketed her to fame, is headed the wrong way, to court. That song, under fire, all because of this lyric. What we have to do right here is go back. Reporter: Now, listen to this. What we have to do right here is go back. Way back. Back into time. Reporter: Grande and her label have been hit with a copyright infringement lawsuit over the song. The lawsuit alleges grande's hit song sounds comparable to the 1972 song "troglodyte" by the jimmy castor bunch. It would be strikingly same lar to the similarity of the words, vocal style and rhythm, are clear indicators that "the way" is copying "troglodyte." Reporter: Grande's legal team told abc news, the alleged offending materials were not provided by ariana. And we trust that the co-writers and producers will resolve the claim with minder. The toy company goldie blocks and the beastie boys are doing a parody. And robin thick sued marvin gave's family over his hit, "blurred lines." I don't think it's any coincidence that a lot of these lawsuits are happening at a time WHEN ARTISTS OF THE '70s AND '80s ARE FINDING IT DIFFICULT TO Monetize their catalog. Ariana's camp is hoping this turns out to be a grande mistake. Paula, thank you. And coming up, the birthday parties.

This transcript has been automatically generated and may not be 100% accurate.